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<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>云课堂</title>
    <style>
        #my-box{
            width: 86vw;
            margin: 10px auto;
            height: 260px;
            box-shadow: 0 0 8px rgba(0,0,0,.2);
            border-radius: 10px;
            overflow: hidden;
            display: flex;
            padding: 0 20px;
            flex-direction: column;
            justify-content: center;
            align-items:center;
        }
    </style>
</head>
<body>
    <div id="my-box">
        <h1 align="center">云课堂</h1>
        <h3 align="center" style="color:#26dc26;">812624</h3>
        <p align="center" style="color:#aaa">此验证码用于身份验证，请勿泄漏给他人</p>
    </div>
</body>
</html>
